AFNetworking/AFOAuth1Client — pull request #25 by madninja (2013-02-21 16:32:09+00:00)
Title: Adding comma (,) as a percent escaped character

since it's in the reserved words per the RFC. This lines up with:

https://github.com/AFNetworking/AFNetworking/pull/814

since signing the escaped parameters and the actual escaping have to line up